Portable extensible lift



Oct. 30, 1951 E KERQSON 2,573,575

PORTABLE EXTENSIBLE LIFT I I Filed 001.. 31, 1947 2 SHEETSSHEET l feaye .zr0fi072 2 SHEETS-SHEET 2 1951 G; E. KEROSON PORTABLE EXTENSIBLE LIFT Filed Oct. 31, 1947 Patented Oct. 30, 1951 PORTABLE EXTENSIBLE LIFT George Keroson, Chicago, 111., :assignor, by direct and mesne assignments, of one-half to George N. Carlson, Chicago, 111., and one-half to George F. Anderson, Cicero, I11.

Application October-31, 1947, Serial No. 783,256

1 Claim.

This invention relates generally to elevators and more particularly to portable extensible stages or lifts and the like for use in painting, redecorating, cleaning, etc. One object is to provide a portable lift or stage of sturdy construction adapted for operation by an individual more easily and readily than he could handle ladders, scaffolding and like-paraphernalia and with remote danger of accident, bodily :injury or property damage which is .a considerable hazard incident to work of thetype mentioned ordinarily.

.A further object is to provide a portable lift that may be operated by the workman from his working position upon the machine without loss of time and with very little effort. A still further object is to provide a portable lift that in addition to carrying the workmanabout the room or structure in which he is at work may also carry his tools and supplies to enable him to proceed with speed and facility.

Other objects, novel features and advantages of arrangement, construction and design comprehended by the invention are hereinafter more fully pointed out or made apparent from the following description of a preferred embodiment as illustrated in the accompanying drawings wherein like reference characters denote corresponding parts throughout.

In the drawings:

Fig. 1 is a view of the instant portable lift as seen from the side, but partly in section.

Fig. 2 is a view of Fig. l as seen from one end and partly in section.

Fig. 3 is a top plan view of the portable lift.

Fig. 4 is a vertical sectional view through Fig. 1 on the line 44, looking in the direction of the arrows.

Fig. 5 is a horizontal cross sectional view through Fig. 4, looking down.

Fig. 6 is a detail horizontal cross sectional view, slightly enlarged, taken on the line 6-6 of Fig. l, and

Fig. 7 is a view partly in cross section and partly in elevation taken on the line 11 of Fig. 1.

The reference numeral I denotes a base frame formed of side rails 2 and end rails 3, the end and side rails being connected at the corners of the frame by the braces 4 through which and through the frame, at the front end, the shanks 5 of yokes 6 extend, said yokes anchored in position by the nuts 1 and operatively associated with the front wheels 8, said yokes formed with an extension 9 connected by links I0 to the transverse steering rod apparatus by pin I2 to the elongated slotted portion l3 of the tongue l4 secured fast by pin l5 to the lower section 1:5 of the tubular steering column l5, l1, said section I5 being secured by the spaced braces I8 to the front rail 3 of the frame, said section [6 immediately above the .top brace I-8, as shown in Fig. 4, being secured in position by the collar i9 about section l5 and secured thereto by the pin 20, said tongue M secured by screw 21 -to the said section I 8.

Secured to the column section It by coupling .22 the rail formed of 'a plurality of sections 23 secured elsewhere by couplings 25 to tubular support post sections 25 supported by and secured to the rails of the frame I, the sections '25 at the rear being at the rear corners of the frame and at the front being spaced inwardly from the front corners thereof and secured to the frame by braces 25. Teleseopically received in the post sections 25 are the cooperating sections 2'! that at their upper ends are secured by plates 28 to the underface of the adjustable platform 25 substantially co-extensive with the frame I and provided with the guard rail 35 supported upon posts 3 I. The steering rod section I7 is formed with the keyway 32 receiving the key 3 3 of rod section 56 permitting vertical adjustment only of the steering rod sections, section I! extending through the platform 29 and being secured thereto by the flanged collars 34 and bolts 35.

Secured to the upper end of the steering column is the steering lever 36. The platform is preferably formed with a large perforation El to provide clearance for the hand wheel 38 having handle 39 and fast to worm shaft journaled in the housing 4| secured to said platform in mesh with the worm gear 42 within said housing and fast to the vertical transmission shaft 53 extending through and operatively supported by said platform, said shaft having a keyway 45 receiving key 45 of bevel gear 55, said shaft 53 extending through a support guide 5? extending transversely of the machine and secured by clamps d8, 48 to the rail sections 23, the said bevel gear 45 being in mesh with bevel gear 59 fast to rotary stub shaft 55 supported in bearings 5| secured to guide ll, said stub shaft 55 having fast thereon the pinion 52 in mesh with the vertical rack 53 secured by plate 55 to the platform 29.

Secured to the under side of the frame I are the yokes 55 that operatively support the drive shaft 56 having fast thereon the wheels 5'! and the clutch member 58 releasably engaged by the clutch member 59 loose on shaft 55 and provided with operating lever 55 fulcrumed to the frame, said clutch member having fast thereupon the sprocket wheel 6| connected by sprocket chain 62 to the sprocket wheel 63 fast upon shaft 64, journaled in housing 64, having thereon the worm 65 connected by bevel gears 66, 61 to the tubular shaft 68 supported in said housing and telescopically receiving the cooperating shaft 69 formed with keyway 10 receiving the key H connecting shaft sections 68, 69 and carried by a collar 12 about shaft 68 at its upper end, said shaft section 69 at its upper end extending through the platform 29 and thereabove provided with the operating hand wheel 13. In operation the vehicle is guided by means of the lever 36 which operates the sectional steering column [6, H, the latter section moving the tongue [4, rod II and the wheels 8. r

The platform 29 is raisedand lowered byrotation of the wheel 38 that rotates worm shaft 40 in mesh with the worm gear 42 that rotates transmission shaft 43 and by means of the bevel gears .46, 49 rotates stub shaft 50 that drives pinion 52 in mesh with the rack 53.. Movement 'worm shafts serve as brake media when the vehicleis stationary to prevent movement on an incline through gravity and serve as a safety feature preventing accidental movement of the machine while the workman is busy, etc. When the clutch members are separated the vehicle may be moved by hand from place to place with facility.

What is claimed is:

In a portable extensible lift, a base frame having wheels thereon, a platform above said base, guide posts on the base and guide posts on the platform telescoping in'the posts on said base frame,'a rail connected-to the upper ends of the guide posts on the base, a rotary transmission shaft carried by said platform and having a hand wheel connected to said shaft for turning the same, a rack carried by said platform parallel'to said transmission shaft, transversely extending straps carried by said rail on opposite sides of said rack and carrying bearings thereon, a pinion shaft journaled in said bearing and carrying a pinion meshing with said rack and a gear on said transmission shaft meshing with a gear on the pinion shaft whereby operation of the transmission shaft moves the platform relative to said base.

GEORGE E. KEROSON.

REFERENCES CITED The following references are of record in the file of this :patent:

UNITED STATES PATENTS 

